Pipeline transport of CO2 mixtures: Models for transient simulation

► We review research challenges for the modelling of transient multiphase flow of CO2. ► This is related to start-up, depressurization, and normal operation of pipelines. ► We pay special attention to depressurization and the possible propagation of cracks. ► We illustrate challenges related to thermodynamics, and wave-propagation velocity. ► Some relevant currently available simulation tools are briefly discussed.